Add TooLarge error code for buffers (#1298)

In collaboration with @yushimatenjin

1 files changed, 20 insertions, 1 deletions

diff --git a/js/buffer_test.ts b/js/buffer_test.ts
index 58668de26..2683b3862 100644
--- a/js/buffer_test.ts
+++ b/js/buffer_test.ts
@@ -1,9 +1,9 @@
 import { Buffer, readAll } from "deno";
+import * as deno from "deno";
 // This code has been ported almost directly from Go's src/bytes/buffer_test.go
 // Copyright 2009 The Go Authors. All rights reserved. BSD license.
 // https://github.com/golang/go/blob/master/LICENSE
 import { assert, assertEqual, test } from "./test_util.ts";
-
 // N controls how many iterations of certain checks are performed.
 const N = 100;
 let testBytes: Uint8Array | null;
@@ -130,6 +130,25 @@ test(async function bufferLargeByteWrites() {
   check(buf, "");
 });
 
+test(async function bufferTooLargeByteWrites() {
+  init();
+  const tmp = new Uint8Array(72);
+  const growLen = Number.MAX_VALUE;
+  const xBytes = repeat("x", 0);
+  const buf = new Buffer(xBytes.buffer as ArrayBuffer);
+  const { nread, eof } = await buf.read(tmp);
+
+  let err;
+  try {
+    buf.grow(growLen);
+  } catch (e) {
+    err = e;
+  }
+
+  assertEqual(err.kind, deno.ErrorKind.TooLarge);
+  assertEqual(err.name, "TooLarge");
+});
+
 test(async function bufferLargeByteReads() {
   init();
   const buf = new Buffer();